Core: Deduplicate exception output (#4036)

When running Generate.py, uncaught exceptions are logged once to a file and twice to the console due to keeping the original excepthook. We can avoid this by filtering the file log out of the stream handler.

Utils.py

@@ -534,7 +534,8 @@ def handle_exception(exc_type, exc_value, exc_traceback):
                 sys.__excepthook__(exc_type, exc_value, exc_traceback)
                 return
             logging.getLogger(exception_logger).exception("Uncaught exception",
-                                                          exc_info=(exc_type, exc_value, exc_traceback))
+                                                          exc_info=(exc_type, exc_value, exc_traceback),
+                                                          extra={"NoStream": exception_logger is None})
             return orig_hook(exc_type, exc_value, exc_traceback)
 
         handle_exception._wrapped = True